[android] Fix crash caused by unreferenced driver

Previously, if the user selected a per-game driver and that driver was
deleted from the global menu, it would cause a crash, it was because of
a mismatch between FileNotFoundException and NoSuchFileException. To
avoid the inconsistency I just made the check for if a file exists or
not to be separate.

Signed-off-by: Aleksandr Popovich <popovich@eden-emu.dev>

src/android/app/src/main/java/org/yuzu/yuzu_emu/utils/GpuDriverHelper.kt

@@ -177,6 +177,10 @@ object GpuDriverHelper {
      * @return A non-null [GpuDriverMetadata] instance that may have null members
      */
     fun getMetadataFromZip(driver: File): GpuDriverMetadata {
+        if (!driver.exists()) {
+            return GpuDriverMetadata()
+        }
+
         try {
             ZipFile(driver).use { zf ->
                 val entries = zf.entries()